题解 | #合并表记录#
合并表记录
http://www.nowcoder.com/practice/de044e89123f4a7482bd2b214a685201
熟练python的字典内置方法即容易 sorted(a):返回类型：列表，返回排序后的index列表
n = int(n)
a = {}
for i in range(n):
line = input().split()
ind = int(line[0])
val = int(line[1])
a[ind] = a.get(ind,0)+val
for i in sorted(a):
print(i,a[i])
